CBSE 11th Standard Chemistry Subject HOT Questions 2 Mark Questions 2021
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CBSE 11th Standard Chemistry Subject HOT Questions 2 Mark Questions 2021
11th Standard CBSE
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Reg.No. :
Chemistry
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In Rutherford’s experiment, generally the thin foil of heavy atoms, like gold, platinum etc. have been used to be bombarded by the α-particles. If the thin foil of light atoms like aluminium etc. is used, what difference would be observed from the above results ?
(a) -
Calculate the approximate charge in coulomb and approximate mass in kilogram of the nucleus of lithium 7 isotope.
(a) -
Aluminium forms the ion Al3+ , but not Al 4+ why?
(a) -
Explain why HF is less viscous than H2O
(a) -
Discuss the hybridisation of Be in gaseous state and solid state.
(a) -
Why standard entropy of an elementary substance is not zero whereas standard enthalpy of formation is taken as zero?
(a) -
Starting with the thermodynamic relationship G = H - TS, derive the following relationship
\(\Delta G=-T\Delta S_{ total }\)(a) -
Calculate the free energy change when 1 mole of NaCl is dissolved in water at 298 K. (Given, lattice energy of NACl = -777.8 kJ mol-1 , hydration energy = -774.1 kJ mol-1 and \(\Delta S=0.043kJ \ K^{ -1 }mol^{ -1 }\) at 298 K).
(a) -
Give reasons.
Conc.HNO3 can be transported in aluminium container.(a) -
Give reasons.
A mixture of dilute NaOH and aluminium pieces is used to open drain.(a)